Sequencing of the plastome in the leafless green mycoheterotroph Cymbidium macrorhizon helps us to understand an early stage of fully mycoheterotrophic plastome structure
Kim, Hyoung T.1; Shin, Chang-Ho2; Sun, Hang3; Kim, Joo-Hwan4
2018-02-01
Source PublicationPLANT SYSTEMATICS AND EVOLUTION
ISSN0378-2697
Volume304Issue:2Pages:245-258
Abstract

To date, plastome studies of mycoheterotrophic orchids have focused on nongreen mycoheterotrophic or partially mycoheterotrophic species. Cymbidium macrorhizon is a fully mycoheterotrophic orchid that lacks leaves and roots, although its inflorescence rachis is pale green. It has degraded stomata, specific fungal partners, and high concentrations of heavy stable nitrogen and carbon isotopes. Therefore, the plastome of this species is expected to represent an early stage of a fully mycoheterotrophic plastome. In this study, we sequenced the plastomes of C. macrorhizon and closely related species (C. ensifolium, C. kanran, and C. lancifolium). Plastomes of the four Cymbidium species were almost identical structurally, but differed somewhat from those of previously studied species. The genes for the photosynthetic subunits of NADH dehydrogenase, ndhF and ndhH, were absent from all four newly sequenced plastomes, whereas only ndhJ was absent from C. ensifolium. In section Pachyrhizanthe (C. lancifolium and C. macrorhizon), ndhE, ndhI, and ndhJ were pseudogenized. With the exception of ndh and ycf, 64 protein-coding genes in C. macrorhizon were apparently functional. Most of them were highly conserved and under purifying selection. Therefore, no direct evidence is available to suggest that genes related to photosynthesis have lost their functions in C. macrorhizon. This discordance between molecular and physiological features for the trophic status of C. macrorhizon might result from a lag between photosynthetic function loss and relaxed purifying selection.

KeywordCymbidium Macrorhizon Mycoheterotroph Ndh Genes Plastome Degradation
DOI10.1007/s00606-017-1472-1
WOS IDWOS:000422970000008
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Cited Times:2[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.kib.ac.cn/handle/151853/60593
Collection植物化学与西部植物资源持续利用国家重点实验室
Affiliation1.Kyungpook Natl Univ, Dept Hort Sci, Daegu 41566, South Korea
2.Korea Natl Arboretum, Div Forest Biodivers & Herbarium, Pochon 11186, Gyeonggi Do, South Korea
3.Chinese Acad Sci, Kunming Inst Bot, Key Lab Plant Divers & Biogeog East Asia, Kunming 650201, Yunnan, Peoples R China
4.Gachon Univ, Dept Life Sci, Seongnam 13120, Gyeonggi Do, South Korea
Recommended Citation
GB/T 7714
Kim, Hyoung T.,Shin, Chang-Ho,Sun, Hang,et al. Sequencing of the plastome in the leafless green mycoheterotroph Cymbidium macrorhizon helps us to understand an early stage of fully mycoheterotrophic plastome structure[J]. PLANT SYSTEMATICS AND EVOLUTION,2018,304(2):245-258.
APA Kim, Hyoung T.,Shin, Chang-Ho,Sun, Hang,&Kim, Joo-Hwan.(2018).Sequencing of the plastome in the leafless green mycoheterotroph Cymbidium macrorhizon helps us to understand an early stage of fully mycoheterotrophic plastome structure.PLANT SYSTEMATICS AND EVOLUTION,304(2),245-258.
MLA Kim, Hyoung T.,et al."Sequencing of the plastome in the leafless green mycoheterotroph Cymbidium macrorhizon helps us to understand an early stage of fully mycoheterotrophic plastome structure".PLANT SYSTEMATICS AND EVOLUTION 304.2(2018):245-258.
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